Photo-litho



voca

AM. PHOTO-LITRO. E0. NY, (OSEORNE'S PROCESS) UNITED sTnTEs PATENT oEEIcE.- A

MILTON ROBERTS, OE BELEAsT, MAINE, AssIGNoR To ROBERTS a PIERCE.

MACHINE FOR TURNING PRISMATIC FORMS.

specification' of Letters Patent No. 12,115, dated December 19, 17854..

Prismatic Forms, of which the following is a full, clear, and exact description, reference being had to the annexed drawings, in

whichp Figure l is a plan of Iny machine; Fig. 2, an end elevation; Fig. 3,' ka transverse sectionv upon the line X'X of Fig. 1 with the'cutters removed; Figadetails to bereferred to hereafter. f

Machines have been contrived for the purpose of cutting prismatic forms in which the block to be turned was caused to traverse beneat-h a cylinder of rotating cutters the motion of the block upon its axis, and also of the carriage upon which it was centered being governed entirely by hand, in consequencel of which the operation of the ma chine is slow and defective.

To remedy these defects and to produce a machine capable of making more perfect work and one in which all the operations shall be automatically performed without assistance from the operative is theobject of my present invention. And my invention consists of an automatic combination of a cylinder of rotating cutters, mechanism for causing the same alternately to approach the block and recede therefrom, and a suitable device for the purpose of turning the block a portion of a revolution after each cut; the operations all succeeding each other in the proper order without requiring the hand of the operative except to take out the finished article and putin a new block.

In the accompanying drawings A is the cutting cylinder, the cutters B being secured to the longitudinal bars of the same by nuts and screws as seen in Fig. l. This cylinder runs in the sliding carriage C which is made to vibrate to and from the material to be cut D, in a manner which will be hereafter explained. The transverse bars of this carriage being made hollow for the purpose of strength as seen in Fig. 3. The block or log D to be operated upon is centered upon puppet-heads E, E in the manner adopted in lathes of-ordinary construction.

Upon the shaft of the mandrel F is a dial plate Gr pierced with circles of holes for the purpose of regulating the number of sides to be given to the prismatic body to be cut.

II is a spindlefwhich slides longitudinally in the framework of the machine and carries the arm I from which projects the catch bolt I) which enters one or other of the holes a of the dial plate. This catch bolty plays within grooves c inthe face ofthe dial 'plate Gr and isp'ressed up. against4 the wheel and retained within the Vgrooves by aspring d.

Motion is communicatedto the machine through the pulley K upon the shaft lofthe cutter cylinder. L is a pulley upon the other end of this shaft from' which motion is communicated by means of the band M to the pulleyjN upon 'the shaft O.

P is a pinion upon the other end of this shaft which engageswith the wheel Q upon the shaftR. Upon the opposite end 'of/this shaft is a pinion S which gears with vthe' wheel T upon the shaftU. This shaftl car.- ries a pinion V seen in red inFig 1 and dotted in Fig. 2. Thisv pinion engages'with the wheel W upon the shaft Y; 'Upon the shaft Y and outside'of the framework of the machine is a disk carrying a crank:A pin f, upon which plays, the connecting'rod. Z, the other yend ofl which is secured tothe framework at g. The parts K,L", M,N, O, P, Q, R, S, T, U, V, W, Y, arel all borne the carriage C, and move'with'it and :the cutter cylinder.

Through the connection of the parts already explained it is evident that as the cutter cylinder revolves the shaft Y will also revolve, though much more slowly, and thus by means of the connection between the crank pin f, and the"` rod Z as the shaft Y revolves it also vibrates back and forth carrying kwith it the sliding carriage and the cutter cylinder to and from the article to be out. The pulley N runs loosely uponthe shaft O, and is clutched therewith by means of the clutch 71., which is moved by the shipping lever A2,` and shipping rod i.

The block to be cut is rota-ted intermittently in the following manner. B2 is an arm pivoted to the frame work at 7c,-to the upper end of which is secured an adjustable arm C2, which carries at its opposite extremity a spring pawl Fig. 4) which operates upon the teeth on the (seen detached in` periphery of the dial plate G to move it in it in and out together with the lever C2. Before the dial plate can be revolved by the spring pawl p-it is necessary that the catch b, be Withdrawn from the hole 6,- this is e'ected in the following manner. E2, is a swinging latch attached to the carriage C, and traveling with it. ter cylinder recedes from its work the inclined surface of the latch E2 bears against the end of the Spindle H of the latch Z2, and withdraws the latter from the hole in the dial plate,-the neXt instant the pin m strikes the lever B2, and the dial plate is revolved until the latch b falls into the next hole a, when the dia-l plate and material are again held stationary until the cylinder has finished its cut and commences to return.

F2, is a lever by operating which the pawl 72, may be held off from contact with the teeth of the dial plate whenever it becomes volved by the motion of the carriage.

Operation: By means of the shipping lever A2 the pulley N is unclutched from Vits shaft O, and the carriage remains stationary While a new block is being centered in the lathe,-the pulley N is then again clutched with its shaft and the carriage advances toprismatic forms consisting essentially of the ward the material. During the rapid advance of the carriage the block is roughed off and worked down rapidly to its ultimate form. During the last moments however of the approach of the cutters to the block, viz.,

while the crank pin f passes its center, the y carriage moves Very slowly, so that an eX- ceedingly thin shaving only is taken off by the cutters and the surface of the article is l thus nished much more highly than has As the cutv case.

- the faces of the nished article will be uted and not plain as has heretofore been the the carriage commences to recede and the latch E2, strikes against the spindle H and withdraws the catch from the hole in the dial plate Gr,the pin m then strikes the arm B2, and the dial plate is revolved until l the catch b falls into the next hole a, and a The cylinderl having finished its cut new portion of the block is presented to the l cutters which now advance again as before. l The number of holes 1n the groove c corresponds to the number of sides to be given to i the finished article. desirable that the dial plate shall not be rej I do not claim a rotating cylinder of cutters in combination with a carriage for holdi ing the block when the motions of the block and of the carriage are governed by the hand ofthe operator but What I do claim as my invention and desire to secure by Letters Patent is- The within described machine for turning cylinder of cutters, the mechanism for rotating the block intermittently and for giving the transverse motion to the revolving cylin- -der, the whole operating automatically in the manner and for the purpose set forth.

MILTON ROBERTS. Witnesses:

`ROBERT WHITE, SAML. F. BURD. 

